30 Questions
Which type of radiation detector exhibits a linear response across a range of radiation quantities?
Ionization chamber detectors
Which type of radiation detector uses phosphor materials and exhibits absorption, excitation, and emission processes?
Scintillon detectors
Which type of light emission occurs immediately within 10^-8 second of stimulation?
Fluorescence
What is the most common crystal used in fluorescence detectors?
Cesium iodide
Which type of detector is known for its exceptional energy resolution and is suitable for applications like gamma-ray spectroscopy?
Scintillation Detectors
What is the main purpose of a dosimeter?
To measure the energy deposited by ionizing radiation
What is the function of signal amplification in a detector system?
To boost the strength of the signal produced by the radiation detector
In which mode of operation does a scintillation detector operate?
Pulse mode
Which of the following best describes location distortion in medical imaging?
The misrepresentation of an object's position on the image relative to other objects
What happens to the projection of an object as the OID increases?
The object appears further from the central ray on the image
How can location distortion impact the accuracy of a diagnostic image?
It can lead to misinterpretation of the position of objects within the image
Which type of detector is often used in Automatic Exposure Control (AEC) systems?
Gas-filled detectors
Which factor determines the geometric efficiency of a detector?
The setup and geometry of the radiation source
Which of the following is a characteristic of the Quantum Detection Efficiency (QDE) of a detector?
It reflects the detector's ability to detect photons effectively
What is the absorption coefficient?
A parameter that describes how efficiently a material can absorb radiation at different energy levels
Which type of detector converts X-rays into visible light before converting it into an electrical signal?
Image Intensifiers
What is the main function of a PMT?
Conversion of light into an electrical signal
Which type of detector operates in a vacuum environment?
PMTs
What is the function of a P-N junction in a semiconductor detector?
One-way flow of electrons
Which of the following best describes the process that occurs when light or X-rays hit the detector in a P-N junction?
Electrons and holes are created, causing a temporary flow of electricity
What happens to the pairs of electrons and holes created when light or X-rays hit the detector?
They move to different sides of the diode
What is the relationship between the flow of current in the detector and the energy deposited by the photons?
The flow of current is proportional to the energy deposited by the photons
Which factor directly controls the quantity of X-rays produced in X-ray emission?
mAs
What is the impact of increasing the kilovoltage peak (kVp) on exposure?
Exponential increase in exposure
Which type of detector is used in digital radiography systems to directly capture X-rays and convert them into digital images?
Digital Radiography (DR) Detector Panels
What is the main purpose of using geometric techniques in X-ray imaging?
To introduce controlled distortion
Which factor directly controls the quantity of X-rays produced?
mAs
Which factor influences subject contrast and the percentage of X-rays transmitted?
kVp
How does changing the focal spot size primarily affect the X-ray beam?
It affects geometric unsharpness and heat distribution
What is the relationship between exposure and kilovoltage peak (kVp)?
Exposure is directly proportional to the square of kVp
This quiz covers the relationship between light emission and energy absorption in dosimeters, as well as the use of phototimers in radiation measurement. Test your knowledge on these topics and learn how light emission can be used to quantify radiation exposure.
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